本文關(guān)鍵詞： 激光選區(qū)熔化 氧化鋁 溫度場(chǎng) 應(yīng)力場(chǎng) 熔化程度 掃描策略 預(yù)熱溫度　出處：《南京理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：陶瓷材料具有耐高溫、耐腐蝕、耐磨損、高強(qiáng)度、高硬度、抗氧化等諸多優(yōu)點(diǎn),近年來(lái)在航空航天、生物醫(yī)療、汽車(chē)、建筑領(lǐng)域內(nèi)的應(yīng)用日益廣泛。然而,陶瓷材料固有的高強(qiáng)度、高硬度、高脆性等特性給傳統(tǒng)加工工藝帶來(lái)了挑戰(zhàn),尤其對(duì)于形狀復(fù)雜的陶瓷件,通常需要借助于復(fù)雜的模具實(shí)現(xiàn),生產(chǎn)周期長(zhǎng),制造成本高,某種程度上限制了陶瓷材料的應(yīng)用和發(fā)展。激光選區(qū)熔化技術(shù)(Selective Laser Melting,SLM)熔融成形、無(wú)需模具、適用材料種類(lèi)多的技術(shù)優(yōu)越性為復(fù)雜陶瓷構(gòu)件的快速制造提供了新的思路。開(kāi)展陶瓷材料SLM成形工藝的研究,不僅可以豐富成形陶瓷的工藝手段,而且能夠顯著縮短陶瓷零件的生產(chǎn)流程,提高成形件性能。本文主要開(kāi)展氧化鋁陶瓷材料激光選區(qū)熔化成形過(guò)程模擬與實(shí)驗(yàn)分析研究,基于仿真分析和工藝實(shí)驗(yàn),研究關(guān)鍵工藝參數(shù)對(duì)陶瓷材料SLM成形效果的影響。主要研究工作包括如下四點(diǎn):(1)研究了 SLM有限元分析理論以及仿真模型構(gòu)建方法,基于溫度場(chǎng)、應(yīng)力場(chǎng)有限元分析理論,設(shè)定了熱源函數(shù)和邊界條件,實(shí)現(xiàn)了材料性能非線性處理以及相變潛熱處理,建立了陶瓷材料有限元分析模型;(2)研究了氧化鋁陶瓷材料SLM成形溫度場(chǎng)仿真分析方法,通過(guò)研究熔池尺寸、溫度梯度分布、液相時(shí)間、升溫速率分析了激光掃描速度、激光功率、掃描策略和預(yù)熱溫度對(duì)溫度場(chǎng)分布的影響;(3)研究了氧化鋁陶瓷材料SLM成形應(yīng)力場(chǎng)仿真分析方法,基于間接熱應(yīng)力耦合法實(shí)現(xiàn)了氧化鋁應(yīng)力場(chǎng)模型的構(gòu)建,探索了成形過(guò)程中的應(yīng)力場(chǎng)分布規(guī)律,分析了激光掃描策略和預(yù)熱溫度對(duì)應(yīng)力場(chǎng)分布的影響;(4)開(kāi)展了氧化鋁陶瓷材料SLM成形工藝實(shí)驗(yàn),研究了不同氧化鋁粉末狀態(tài)對(duì)應(yīng)的鋪粉質(zhì)量差異,分析了掃描速度、激光功率、掃描策略對(duì)氧化鋁陶瓷材料熔化程度的影響,探索了預(yù)熱溫度對(duì)成形效果的影響規(guī)律,驗(yàn)證了仿真結(jié)果的有效性。
[Abstract]:Ceramic materials have many advantages, such as high temperature resistance, corrosion resistance, wear resistance, high strength, high hardness, oxidation resistance and so on. In recent years, ceramic materials have been widely used in aerospace, biomedical, automobile and construction fields. The inherent characteristics of ceramic materials such as high strength, high hardness and high brittleness have brought challenges to the traditional processing technology, especially for ceramic parts with complex shapes, which usually need to be realized by means of complex dies, and the production cycle is long. The high manufacturing cost limits the application and development of ceramic materials to some extent. Laser selective Laser melting (SLM) melt forming. The advantages of many kinds of suitable materials provide a new idea for rapid manufacturing of complex ceramic components. The research on SLM forming process of ceramic materials is carried out. It can not only enrich the process of forming ceramics, but also shorten the production process of ceramic parts. In this paper, the simulation and experimental analysis of laser selective melting forming process of alumina ceramic material are carried out, based on simulation analysis and process experiment. The main research work includes the following four points: 1) the theory of SLM finite element analysis and the method of constructing simulation model are studied. Based on the theory of finite element analysis of temperature field and stress field, the heat source function and boundary condition are set up, the nonlinear treatment of material performance and latent heat treatment of phase change are realized, and the finite element analysis model of ceramic material is established. The simulation analysis method of temperature field of alumina ceramic material SLM was studied. The laser scanning speed and laser power were analyzed by studying the size of molten pool, temperature gradient distribution, liquid phase time and heating rate. The influence of scanning strategy and preheating temperature on temperature field distribution; The simulation analysis method of SLM forming stress field of alumina ceramic material is studied. Based on the indirect thermal stress coupling method, the stress field model of alumina is constructed, and the distribution law of the stress field in the forming process is explored. The effects of laser scanning strategy and preheating temperature on force field distribution are analyzed. (4) the SLM forming process experiment of alumina ceramic material was carried out, the quality difference of different alumina powder state was studied, the scanning speed and laser power were analyzed. The effect of scanning strategy on the melting degree of alumina ceramic material was studied. The effect of preheating temperature on the forming effect was explored and the validity of the simulation results was verified.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ174.6

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